Join Justin Schwartzenberger for an in-depth discussion in this video Error handling, part of Angular 2 Essential Training.
- [Instructor] Let's take a look at how you can use…the Angular forms system…to provide some error feedback in the UI.…The media item form has the required…pattern and year validators.…We can use the errors property…off of the parts of the form…to show some text messages for these fields.…Angular will add an errors property to the form control,…form group, or form array objects when they are invalid.…And since we are doing the model driven,…or reactive approach here,…we have a component property named form…that has our form group we created…to represent the form.…
The form group object has a method named get…that takes in a string…and can be used to find a child control by name.…We can use this method…to get to the named controls we created…off of that form object.…And form groups, controls, and arrays…have a method named has error…that takes a string that can be used to check…if there are any errors by an error name.…We can use that to identify…if we have a specific error.…
So in the media dash item dash form dot component…
Justin Schwartzenberger steps through the framework one feature at a time, focusing on the component-based architecture of Angular. Learn what Angular is and what it can do, as Justin builds a full-featured web app from start to finish. After mastering the essentials, you can tackle the other project-based courses in our library and create your own Angular app.
- What is Angular?
- Setting up an Angular template
- Creating a component
- Binding events and properties
- Getting data to components
- Using directives and pipes
- Creating Angular forms
- Validating form data
- Understanding dependency injection
- Providing services
- Making HTTP calls
Skill Level Intermediate
Q: This course was updated on 03/01/2018. What changed?
A: The following topics were updated: directives and pipes, forms, dependency injection and services, HTTP, and routing.
1. Architecture Overview
3. Directives and Pipes
5. Dependency Injection and Services
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